Invasive Cancer in Accessory Axillary Breast: a Rare Presentation

Accessory breast tissue has an incidence of 0.3–6% and primary cancer arising in it is even rarer 0.2–0.6%. It may have aggressive course with tendency for early metastasis. Due to its rarity, variety of differentials, and lack of clinical awareness, treatment is usually delayed. We present here an interesting case of a 65-year-old lady with a 8 × 7-cm hard lump in right axillary region for 3 years with fungation for 3 months and with no concomitant breast lesion or axillary lymphadenopathy. Biopsy revealed invasive ductal carcinoma with no systemic metastasis. Management of accessory breast cancer follows same guidelines with primary treatment being wide excision and lymphadenectomy. Adjuvant therapies include radiotherapy and hormonal therapy.